Toro Rosso has been supplied by Renault in 2015 but with Red Bull cutting its ties with the French manufacturer, its junior team is set to follow suit.

Toro Rosso's only viable option is a return to Ferrari power, which it most recently used in 2013, but with no deal having yet been struck Sainz is wary that the delay could be having a negative effect on next year's hopes.

"I just know that the team obviously is working hard, and now more than ever, to find something for next year," he explained.

"Obviously it starts to be a bit late and we need to design all the rear part of the car. When you don’t have something at the rear at this stage of the year, it’s a bit tricky - but I have full trust that they will come to a solution.

"To an agreement. I think Red Bull more than anyone deserves… they have done a lot for this sport, a lot for Formula One and they will end up having a decent engine, a decent package for next year."